Sewing machine



Nov. 18, 1941. P. GINSBERG SEWING MACHINE Sheets-Sheet 1 Filed May 16, 1940 INVENTOR- Ph: 0 Gmsbe 5 aid Kama ATTORNEYS Nov. 18,1941. P. GINYSBERG 2,253,268

w SEWING MACHINE Filed May '16, 1940 2 Sheets-Sheet 2 E g YIIIVVENTOR.

. 1 71]! finsber BY jk/fld ATTORNEYS Patented Nov. 18, 1941 UNITED STATES PATENT OFFICE SEWING MACHINE Philip Ginsberg, New York, N. Y.

Application May 16, 1940, Serial No. 335,460

1 Claim.

My invention relates to a new and improved sewing machine.

One of the objects of the invention is to improve the type of sewing machine which produces the straw or saddle stitch.

Another object of the invention is to provide simple parts which canbe installed in existing sewing machines of this type.

Another object of the invention is to provide an improved eccentric and link arrangement, whereby the length of the loops of the chain stitch which are produced by this type of machine, can be conveniently regulated so as to produce loops of any desired length.

Other objects of the invention will be set forth in the following description and drawings which illustrate a preferred embodiment thereof, it being understood that the above statement of the objects of my invention is intended to generally explain the same without limiting it in any manner.

Fig. 1 is a bottom'plan View of a standard sewing machine to which my improvements have been applied. In this view, part of the representation of member I has been omitted, so as to show a part of the representation of shaft 65, which is located above member I5, and which is concealed by member I5 in this view.

Fig. 2 is a side elevation, taken at the lefthand side of Fig. 1.

Fig. 3 is a transverse section, partially in elevation, in a plane which is parallel to the plane of Fig. 2.

Fig. 4 is a sectionalview on the line 44 of Fig. 3.

Fig. 5 is a sectional view on the line 55 of Fig. 1.

Fig. 6 is a sectional View on the line 6-6 of Fig. 5.

A plate 450:. is integral with the frame of the machine. A housing which has depending vertical walls is integral with said plate 45a. The driven power shaft II has bearings in said depending vertical walls. The housing is provided with a cover plate I6 which is held to said housin each bushing 22.

vided with suitable bearings in said depending:

walls of the housing. One of said bearings 65a 1 is shown in Fig. 1. This bearing may be an ordinary bushing. A collar I8 is connected to said shaft 65 by means of the clamping screw I9. One end of the link 20 is connected to the adjacent end face of the collar I8. The 'means for connecting the link 20 to the collar I8 are identical with the means which are used for connecting said link 20 to the sleeve Ilia, which is integral with the disc 26. Said means are shown in detail in Figs. 5 and 6. i

The link 20 is provided with a longitudinal slot 2|, which has enlargements at the respective ends thereof. A bearing bushing 22 is located in each said enlargement. The legs of the link I 20 are urged towards each other by'means of pressure screws 32, in order to clamp the bushings 22 in position. A ball 23 is turnably located The bushings 22 are sufficiently resilient to enable the balls '23 to be respectively inserted therein by suitable pressure. Each ball 23 has a diametral bore, which is not tapped. Each ball 23 has a respective screw 24, whose shank passes through said untapped bore. The end face of the collar I8 is provided with a tapped recess, whose wall is engaged by the corresponding threaded portion of the shank of a screw 24. A metal'spacing washer 25 is located between the end face of the collar I8 and the. respective ball 23, and a similar metal spacing washer 25 is located between the circumferential waall of the sleeve I8a and the respective screw 2 the screws 24 and their respective connected parts. Instead of providing a single hole in the end face of the collar I8, three or more such holes could be located along a radial line of said end face, in order to regulate the throw of the link 20, when the shaft 65 and its collar I8 are continuously revolved. The sleeve I8a isturnably mounted upon a stud which is connected to the plate 28, which is clamped to the frame F of the machine by means of screws 29. A holding screw 3| is connected to the wall of a recess of said stud, in order to prevent longitudinal movement of the sleeve I8a relative to said stud.

By means of this construction, the shaft 65 rocks the sleeve Ba and the disc 26, and the amplitude. of the rocking movement can be regulated by regulating the throw of the link 20.

Likewise, th ball-and-socket connections being by the screws II. A shaft 65 is provided tween the link 20. and the collar I8 and the These washers 25 prevent binding between sleeve I8a, make it possible for the shaft 65 to rock the sleeve Ilia and its disc 26, even though the axis of oscillation of the sleeve [8a is at right angles to the axis of rotation of the shaft 65.

A link 33 is pivotally connected by a pivot screw 34a to the disc 26. Said link 33 has a slotted head 34, which has resilient legs. These legs are forced towards each other by means of the clamping screw 35, so that the slotted head 34 clamps the shank of a screw 36, which is similar to the screw 24 heretofore described. Said screw 36 is connected by ball-and-socket means to the link 31. The ball-and-socket means which connect the screw 36 to the link 3'! are not shown specifically, because they are identical with the ball-and-socket means heretofore described.

The link 31 has a slotted end whose resilient legs are clamped by means of the screw 4| to the turnable pivot pin 40 which is turnably mounted in a bearing sleeve 42, which is fixed to the plate 9. Said plate 9 is connected to frame F by screws ID. A block 43 is clamped to the turnable pivot pin 40, by means of a clamping screw 40a. The sleeve 42 is provided with a shoulder upon which the block 43 abuts. The spreader 44 is clamped to the block 43 by means of the clamping screw 45. The spreader 44 is thus oscillated, and the length of its oscillating movement is regulated by the adjustment of the screw 24 relative to the center of rotation of the end face of the collar I8.

The looper 60 is an integral projection of a plate Me. This plate 6lc is clamped to a supporting plate 6|, by means of screws Md. The plate BI is provided with a flange Gla at one edge of its rim. The plate 6| is mounted turnably at the end of a stationary rod which extends through the vertical depending walls of the previously mentioned housing. This rod I5 is fixed to said housing by clamping screws or in any suitable manner. The plate 6| is turnably mounted upon a pivot stud 62, which has a threaded shank which engages a tapped recess of the rod l5. A metal spacing washer 62a. is also provided so that the plate 6| can turn freely relative to the members 62 and [5, This washer 62a is clearly shown in Fig. '7, and this detail is not shown in the other figures.

The plate 6! is provided with an inclined slot 62b. The shaft 65 has a collar 64 clamped thereto and said collar 64 is provided with an eccentric pin 63 which enters said slot 62b. Therefore, when the shaft 65 is revolved, the plate 6| and the looper plate 6|c are oscillated, so as to oscillate the looper 60.

No adjustment is provided for the oscillation of the looper 60, which moves back and forth in a stroke of constant length.

In addition to its bearings in the depending wall of the housing, the shaft H has an additional bearing 46, which is integral with the plate 45a which is integral with frame F.

The feed-mechanism is of the conventional type, so that it is not fully illustrated. It is well-known in sewing machines on the market, such as the Union Special No. 16-200. The feed-dog 4 is operated with the usual four-motion movement. It is connected to the bent rod 96, which is fixed by screw 9| to the end-block of member 55. Said member is pivotally connected at 92 to link 96 which is actuated by an eccentric pin of drive shaft ll, so as to give the feed-dog 4 its up-and-down movement.

The longitudinal reciprocating movement of the feed-dog is produced by eccentric 5|, whose reduced integral collar 51 is clamped to the driveshaft II by clamping screw 58. The member 55 has the usual follower-shoe 56, which abuts the periphery of eccentric 5 I, so that when the eccentric 5| is rotated, it produces a longitudinal reciprocating movement of member 55.

The usual means are provided for regulating the length of the feed stroke, in accordance with the length of the loop of the chain stitch. The rod 48 is turnable around its longitudinal axis, and it is clamped to its adjusted position after it has been turned, in the well-known manner. This rod 48 passes through a bearing of the extension 41 of the plate 45a. Collar 49 is clamped to rod 48 by clamping screw 50, in order to prevent longitudinal movement of rod 48 in its bearing, in one direction. The arm 52 is fixed to rod 48. Said arm 52 is connected by member 53 to the arm 54, which is integral with member 55. Therefore, by turning rod 46, the distance between the shoe 56 and the surface of eccentric 5| can be regulated, thus regulating the length of the feeding stroke of the feed-dog 4.

The link 96 of the drive shaft moves the feeddog up and down in the usual manner.

The novel parts can therefore be readily applied to several standard sewing machines, such as the Union Special No. 16-200, in order to oscillate the spreader in a stroke of variable length.

I have shown a preferred embodiment of my invention, but it is clear that numerous changes and omissions can be made without departing from its spirit.

I claim:

A sewing machine comprising a shaft, means adapted to rotate said shaft continuously in the same direction, a first rockable member mount ed for oscillation about an axis which is at right angles to the axis of rotation of said shaft, a first link connected to said shaft at a point which is offset relative to the axis of rotation of said shaft, said first link being also connected to said first rockable member to oscillate said first rockable member when the shaft is rotated, the respective connections between said first link and said shaft and also between said first link and said first rockable member including ball-andsocket means adapted to permit the first link to tilt without binding relative to said shaft and relative to said first rockable member, a second rockable member, a spreader connected to said second rockable member, a second link connecting said second rockable member and said first rockable member, said second rockable member being mounted for oscillation about an axis which is parallel to said axis of oscillation of the first rockable member, said second rockable member being oscillated together with the first rockable member, a looper mounted to oscillate, means driven by said shaft and adapted to oscillate the looper.

PHILIP GINSBERG. 

